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A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

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In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

High Court upholds Nauru rape verdicts

The High Court has upheld the convictions of an Australian man and his wife who were jailed for raping the wife's 21-year-old niece on Nauru in 2011.

The bench of three judges unanimously rejected an appeal by Terrence and Tekena Diehm, finding no miscarriage of justice in their trial on Nauru before a single judge, former Victorian Justice Geoffrey Eames.

The case came to Canberra because Nauruan law says Australia's High Court is the final court of appeal for decisions in their system.

In the trial, the victim said she came to the Diehm house after an argument with her boyfriend. Over the following day, the wife repeatedly suggested she have sex with her husband.

On the second evening, the wife held a knife to her face and led her to the living room where the couple had sex with her.

Justice Eames found them guilty, sentencing the husband to three years jail and the wife to two years, dating from November 2011.

The High Court judges dismissed their appeals, finding no miscarriage of justice in the way the trial was conducted.